Series-Connected Electrode Assembly Layout for Higher Battery Energy Density
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Solution Overview
Problem
Existing battery packs face challenges in achieving high energy density due to the space occupied by brackets and shells for fixing and packaging multiple batteries connected in series or parallel.
Innovation Solution
The electrochemical device incorporates a housing with accommodation cavities for separate sub-electrode assemblies, which are connected in series through overlapping tabs and conductive pieces on a circuit board, reducing internal resistance and optimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple batteries are connected in series or parallel to achieve high voltage and high capacity, then the charging power and discharging power are improved, but the space occupied by brackets and shells increases, leading to decreased energy density
Solution Approach 1:
The patent merges multiple batteries into a single integrated battery pack structure with shared housing and bracket system. The housing contains accommodation cavities for multiple electrode assemblies, and a single bracket structure supports multiple batteries simultaneously, replacing multiple separate fixing components. This consolidation reduces the total volume of packaging components while maintaining the series/parallel connection configuration for high power output.
Solution Approach 2:
The patent implements a nested arrangement where multiple electrode assemblies are positioned within accommodation cavities of the housing. The tab structures are nested by having tabs from different batteries overlap and connect to the same conductive pieces on the circuit board, reducing the spatial footprint of connection components while maintaining electrical connectivity for series/parallel configurations.
2Power
If multiple batteries are connected in series or parallel, then the desired high voltage and high capacity are achieved, but more brackets and shells are required, increasing device complexity
Solution Approach 1:
The patent combines multiple battery fixing functions into a single integrated bracket structure. Instead of requiring separate brackets for each battery, one bracket system supports multiple electrode assemblies within the housing. The housing itself serves as both packaging and structural support, eliminating the need for additional external shells or brackets.
3Reliability
If tabs from different batteries are connected to separate conductive pieces, then electrical connectivity is ensured, but the space occupied by tabs and connecting components increases
Solution Approach 1:
The patent implements tab nesting where tabs from different electrode assemblies overlap in the vertical direction and connect to the same conductive pieces on the circuit board. Specifically, tabs are arranged such that a tab from one battery overlaps with a tab from another battery, and both connect to shared conductive pieces. This nested tab arrangement significantly reduces the horizontal space required for connection components while maintaining reliable electrical connectivity for series and parallel configurations.
Data Source
AI summary
An electrochemical device includes a housing; a circuit board; and an electrode assembly including a first sub-electrode assembly and a second sub-electrode assembly mounted in the housing along a first direction. A first tab and a second tab of opposite polarities are disposed on the first sub-electrode assembly. A third tab and a fourth tab of opposite polarities are disposed on the second sub-electrode assembly. The first tab and the fourth tab are of opposite polarities. A plurality of conductive pieces are disposed on the circuit board. The first tab and the fourth tab each are connected to one separate conductive piece. The second tab is connected to the third tab. The second tab is connected to one of the conductive pieces. The first sub-electrode assembly and the second sub-electrode assembly are connected in series by the second tab and the third tab.